Grinding runner



3 April 19, 1932. Q J DRAKE I 1,854,508

GRINDING RUNNER Filed June 27, 1929 2 Sheet-Sheet l April 19, 1932. J.1.. DRAKE I GRINDING RUNNER Filed June 27, 1929 2 Sheets-Sheet 2Patented Apr. 19, 19 32 JOHN L.

E, OF TOLEDO, OHIO, ASSIGNOB TO LIIBBEY-OWENS-FORD GLASS COM- orricaPANY, OF TOLECDO, OHIO, A CORPORATION OF OHIO GRINDING RUNNERApplication filed June 27,

lhe present invention relates to apparatus designed for the surfacing ofglass sheets or plates or other flat sheets of material and has for itsprincipal object the provision of an improved form of grinding head orrunner for use in the manufacture of plate lass.

Another object of the invention resi es in the rovision of a novel formof grinding head or runner of the above character comprising an annularplate, disc or wheelhavavoided, to the end that a more uniform finishover the glass may be had.

Other objects and advantages of the invention will become more apparentduring the course of the following description when taken in connectionwith the accompanying drawings.

In the drawings forming a part of this application and wherein likenumerals are employed to designate like parts throughout the same,

Fig. 1 is a bottom view of one form of grinding head or runner. providedby the present invention.

Fig. 2 is a transverse section of the grinding runner takensubstantially on line 2-2 of Fig. 1 and showing the same in associationwith a glass supporting table. and

Figs. 3, 4 and 5 are views similar to Fig. 1, but showing modifiedarrangements of the grinding projections on the runners.

In the production of plate glass, a sheet of glass commonly termed aplate glass blank is ordinarily ground and polished on both sidesthereof by subjecting it to the action of abrasive materials and apolishing me- 1929. Serial No. 374,029.

dium. It is quite common to use such abrasives as sand, garnet, emery orthe like, the abrasive being ordinarily suspended in water to permiteasy handling, etc. The grinding is accomplished by suitably supportingthe 55 lass blank and creating relative movement etween said blank and asuitable surfacing member 'or tool which contacts therewith, means beingprovided for supplying the abrasive material between the sheet and sur-00 facing member.

There are numerous methods of grinding and polishing plate glass, andthis invention is not limited to any one particular system. However, byway of example, the invention 5 has been illustrated in Fig. 2 of thedrawings in connection with the so-called continuous system wherein asheet of glass 10 to be surfaced is suitabl supported upon a table 11and adapted to he carried thereby successively beneath and in contactwith a series of grinding and polishing members. The grindmg memberprovided'by the present invention may, however, be also used inconnection with a rotary glass supporting table, if 7 desired.

The grinding head or runner herein provided is carried at the lower endof a vertical drive spindle 14 of the grinding machine and comprises abase plate, disc or so wheel 15 ordinarily formed from cast-iron or someother suitable metal. Formed integral with or removably carried by oneface of the base plate are a plurality of spaced grinding lugs orprojections 16.

In the form of the invention illustrated in Figs. 1 and 2, the grindingprojections '16 are arranged in a plurality of annular rows A, B, C,etc., the several rows being concentric with respect to one another butnot 0 concentric with the center of base plate 15.

On the other hand, the annular rows of grinding projections A, B, C,etc., are swung about the common axis indicated 17 which is off-set fromthe center of the disc and the axis of rotation thereof which isindicated 18 so that the annular rows of projections are arrangedeccentric with respect to the axis of rotation of base plate15. Due tosuch an arrangement, upon rotation of the grinding runner in contactwith the glass, there will be provided an eflicient break-up motion andscrubbing action which will greatly aid in and facilitate the grindingoperation. Also, no one grinding projection will follow in exactly thesame path traversed by the preceding projection so that each succeedingprojection will swing in a slightly different orbit than the precedingprojection and travel in a different path over the glass. As a result, amore uniform grinding action over the entire surface of the glass willbe had and the tendency toward grooving of the sheet will be greatlyminimized if not entirely eliminated. It will be readily apparent thatwhen the grinding projections are arranged in a plurality of rowsconcentric with the axis of rotation of the disc, that all of theprojections in any one row will follow in the same path over the glassand that there will be a tendency toward grooving of the sheet. However,with the present arrangement, this objectional feature Will be avoided.Further, it will be noted that no two of the grinding )rojections on thesame side of the runner, as defined by a straight line designated 19,passing through the two centers 17 and 18 will travel in the same pathor orbit.

The base plate or main castin 15 also carries an annular abrasive supply trough 20 provided at a plurality of points with openings whichcommunicate with openings 21 extending through therunner so that theabrasive material will be discharged from trough 20 downwardly onto theglass within the cavity or opening 22 arranged inwardly of the innermostrow of grinding projections A.

In Figs. 3, 4 and 5, different arrangements of the grinding projectionsare shown and by which the objects of the present invention may also beaccomplished. In Fig. 3, the grinding projections 16 are arranged uponthe annular base member 15 in a plurality of elliptical rows concentricwith one another and also with respect to the center or axis of rotationof said runner. In Fig. 4 is shown an arrangement similar to that ofFig. 3 with the exception that while the elliptical rows of grindingprojections are concentric with one another they are eccentric withrespect to the axis of rotation of the disc as with the form ofinvention illustrated in Figs. 1 and 2. In Fig. 5 the base member 15 iselliptical instead of circular and the elliptical rows of grindingprojections 16 are arranged symmetrical over the face thereof.

It is to be understood that the form of the invention herewith shown anddescribed is to be taken as the preferred embodiment of the same, andthat various changes in the shape, size and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claims.

I claim:

1. In surfacing apparatus, a rinding runner including a rotatable circuar base member and a plurality of spaced grinding projections carriedupon one face thereof, said projections being arranged upon the basemember in a plurality of elliptical rows.

2. In surfacing apparatus, a rinding runner includin a rotatable circuIar base member and a p urality of spaced grindin projections carriedupon one face thereo said projections being arranged upon the base memer in a plurality of elliptical rows eccentric with respect to the axisof rotation thereof.

Signed at Toledo, in the county of Lucas and State of Ohio, this 22ndday of June,

JOHN L. DRAKE.

